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<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
</head>
<body>
    <!-- 计算[2, 6, 18, 15, 40] 中能被3整除的偶数的和 -->

    <script>

        let arr = [2, 6, 18, 15, 40]

        let num = 0;

        for (let i = 0; i < arr.length; i++) {
            const element = arr[i];
            if(element % 3 === 0 && element % 2 === 0){
                num+=element
            }
        }
        alert(num)
    </script>
</body>
</html>